fix(audio): count buffered timestamp gaps only once

[yashranaway]

when mic audio has two or more timestamp gaps waiting in the encoder's resample buffer, the buffer counted the first gap again for every later chunk. so it thought it had more audio than it did and handed the encoder a full aac/opus frame before that audio existed, with the end of the frame never written.

it now moves its position past each gap once. two tests cover it: a request one sample bigger than what's buffered used to succeed, and a flush after a partial read came out 100 samples too long. both fail on main.

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge.

Summary

Fixes BufferedResampler so a buffered timestamp gap is not counted again for later frames.

• Buffered audio counts each timestamp gap only once.

Static review found no actionable issues. Tests were not run.

_{Reviews (1) · Last reviewed commit: "fix(audio): count buffered timestamp gap..." · Reviewed by Greptile}

[yashranaway]

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